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Day 517: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Chemical Bonding and Molecular Structure. Asked once: 2021 Paper 7

    39
    Which of the following compound CANNOT act as a Lewis base?

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  2. Question 2

    Chemical Kinetics. Asked once: 25 Jul 2022

    145
    For the decomposition of azomethane. CH3 N2CH3( g)→CH3CH3( g)+N2( g)CH_{3}{\text{ }N}_{2}CH_{3}(\text{ }g) \rightarrow CH_{3}CH_{3}(\text{ }g) +N_{2}(\text{ }g) a first order reaction, the variation in partial pressure with time at 600 K600\text{ }K is given in the figure. The half-life of the reaction is ____×10−5 s\_\_\_\_ \times10^{- 5}\text{ }s. [Nearest integer]

  3. Question 3

    Chemical Thermodynamics. Asked once: 1 Feb 2023

    56
    At 25∘C25^{\circ}C, the enthalpy of the following processes are given:
    H2( g)+O2( g)→2OH(g)ΔH∘ =78 kJ mol−1H2( g)+1/2O2( g)→H2O(g)ΔH∘ =−242 kJ mol−1H2( g)→2H(g)ΔH∘ =436 kJ mol−11/2O2( g)→ O(g)ΔH∘ =249 kJ mol−1\begin{matrix} & H_{2}(\text{ }g) +O_{2}(\text{ }g) \rightarrow 2OH(g)\Delta H^{\circ}\ = 78\text{ }kJ{\text{ }mol}^{- 1} \\ & H_{2}(\text{ }g) + 1/2O_{2}(\text{ }g) \rightarrow H_{2}O(g)\Delta H^{\circ}\ = - 242\text{ }kJ{\text{ }mol}^{- 1} \\ & H_{2}(\text{ }g) \rightarrow 2H(g)\Delta H^{\circ}\ = 436\text{ }kJ{\text{ }mol}^{- 1} \\ & 1/2O_{2}(\text{ }g) \rightarrow\ O(g)\Delta H^{\circ}\ = 249\text{ }kJ{\text{ }mol}^{- 1} \\ & \end{matrix}
    What would be the value of XX for the following reaction? (Nearest integer)
    H2O(g)→H(g)+OH(g)ΔH∘=XkJmol−1H_{2}O(g) \rightarrow H(g) + OH(g)\Delta H^{\circ}=XkJmol^{- 1}

  4. Question 4

    Classification of Elements and Periodicity. Asked once: 1 Feb 2023

    124
    The correct order of bond enthalpy (kJmol−1)\left( kJmol^{- 1} \right) is :

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  5. Question 5

    Haloalkanes and Haloarenes. Asked once: 31 Jan 2023

    137
    In the following halogenated organic compounds the one with maximum number of chlorine atoms in its structure is:

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